Optical Member Dye Stack for Polarizer-Free Display Light Control
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Solution Overview
Problem
Existing light emitting displays face issues with external light reflection at a surface of a panel therein, the light emitting displays may include a polarizing plate on an upper surface of the panel therein. The polarizing plate may include a polarizer, a retardation film, and a UV absorber to prevent damage to a light emitting device due to external light.
Innovation Solution
An optical member comprising a first transmittance control layer with dyes having a maximum absorption wavelength of 570 nm to 610 nm, a second transmittance control layer with a mixture of dyes having absorption wavelengths of 400 nm to 440 nm, 480 nm to 520 nm, and 650 nm to 700 nm, and a base film, stacked sequentially, to enhance resistance to light and improve color reproduction without a polarizing plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarizing plate is used to prevent external light reflection and damage to light emitting devices, then protection against external light is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the polarizing plate from the display device, replacing it with a simplified optical member consisting of a substrate with specific dye layers that provide both protection and optical control functions without requiring polarizing materials
Solution Approach 2:
The optical member integrates multiple functions into a single component: UV protection, visible light reflection control, and color management are all achieved through the combination of UV absorber and specific dye layers, eliminating the need for separate polarizing plate and UV filter components
2Reliability
If dyes with broad absorption ranges are used to improve UV resistance, then protection against light damage is improved, but color reproduction accuracy deteriorates
Solution Approach 1:
The patent segments the optical filtering function into distinct layers: a UV absorber layer for UV protection and separate dye layers (first and second dyes) with specific absorption wavelength ranges for visible light control, allowing each layer to be optimized for its specific function without interfering with color accuracy
Solution Approach 2:
The patent applies different dye materials with specific absorption characteristics to different regions/layers of the optical member, with the first dye absorbing in the 480-520nm range and the second dye absorbing in the 650-700nm range, ensuring that each material performs its specific function optimally while maintaining overall color reproduction accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optical member provides improved resistance to light, minimizing light transmittance variation and damage to light emitting devices, while maintaining high luminance and color accuracy, even after long-term exposure to UV light and temperature cycles, without the need for a polarizing plate.
Implementation Method 1
the first transmittance control layer includes a dye having a maximum absorption wavelength of 570 nm to 610 nm
Implementation Method 2
the second transmittance control layer includes a mixture of a dye having a maximum absorption wavelength of 400 nm to 440 nm, a dye having a maximum absorption wavelength of 480 nm to 520 nm, and a dye having a maximum absorption wavelength of 650 nm to 700 nm
Data Source
AI summary
An optical member includes a first transmittance control layer, the first transmittance control layer including a dye having a maximum absorption wavelength of 570 nm to 610 nm, a second transmittance control layer, the second transmittance control layer including a mixture of a first dye having a maximum absorption wavelength of 400 nm to 440 nm, a second dye having a maximum absorption wavelength of 480 nm to 520 nm, and a third dye having a maximum absorption wavelength of 650 nm to 700 nm, and a base film, the second transmittance control layer being between the base film and the first transmittance control layer.